單項(xiàng)選擇題在相同的磨削條件下,砂輪粒度怎么變化會(huì)使表面粗糙度值減?。ǎ?/strong>

A.砂輪的粒度號(hào)數(shù)增大
B.砂輪的粒度號(hào)數(shù)減小
C.砂輪的粒度號(hào)數(shù)不變


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